Bulldozer



June 15, 1943 T. R. PAULSEN- BULLDOZ ER Filed Aug. 9, 1941 2 Sheets-Sheet 1 M QMMM INVENTOR.

ATTORNEYS.

June 15, 1943. T. R. PAULSEN BULLDOZER 2 Sheets-Sheet 2 Filed Aug. 9, 1941 Patented June 15,1943

My invention-relates to new and useful improvements in bulldozers, and moreparticularly to that type of bulldozer in which thevscraping blade is pushed ahead of a tractor.

Such devices are usually'designed for attachment to some conventional type of tractor. They 4 ---DUNIT'AED STATES PATENT OFFICE RBssuEo.

MAR 61945 BULLDOZER Thomas B. Paulsen, South Milwaukee, Wis, as-

signor to Bucyrus-Erie Company, South Milwaukee, Wis., a co ration of Delaware Application August 9, 1941, Serial No. 406,090

'4 Claims. (Cl .37145 The'frontend of each bell-crank supports one I side of theblade I 6 through a link 23.

consistof a blade, two arms pivoted on the tractor for pushing the blade, and-means to raise and lower eitherarln with a certain degree of independence from the lowering and raising of the other arm. The last-mentioned means usually consists of one or two hydraulic cylinders actuated ,by a pump driven by, the engine of the tractor. v

If two such cylinders are used, it is convenient to have them controlled by a single controlvalve. It is the principal object of my invention to add to the conventional bulldozer a ripper, so contrived that they can be operated respectively by one and the same mechanism.

In addition to my principal object, above stated, I have worked out a number of novel There are two cylinders 24, each pivoted at 25 on one of the links ll. The piston rod 28 of each cylinder is pivoted at 21 to the short arm of the bell-crank 22.

The rear ends of the two cylinders are connected by a pipe 28, from which a pipe 29 leads to a control-valve Ill. The front ends of the two cylinders are similarly connected by -a pipe 3|,

- from the rear of the cylinders into the'front, and

,and useful details, which will be readily evidentv dozer and ripper, m a 3 my invention, shdw-' ing in full lines the mechanism in bulldozing position, and in dotted lines the mechanism in ripping position.

Figure 2 is a plan view of my invention. Referring now to the figures, we see that H is a conventional tractor, mounted on creeping thus retract the pistons; (2) to pump from the front of the cylinders into the rear, and thus thrust the pistons out; (3) to close both pipe 29 and pipe 32, and thus hold the pistons; and (4) to open pipe 28 to pipe 32, and thus permit free floating of the piston.

From the valve a pressure pipe 38 and a suction pipe 34 lead to a pump 35, actuated in any occupied by the piston rods 26 within the cylin-' ders 2d when the pistons are being retracted and yet hold them as w t unintended retracting.

It will be noted that pivot point N, for the rear ends of my arms Ill, is on the ends of the rear axle of the creeping traction. This is advisable, but not essential.

Upwardly extending from each push-arm l5,

adjacent this point I4, is a bracket 46,.to which is pivoted the elbow of a bell-crank-shaped riptraction l2. These creeping traction elements are pivoted on propelling shaft 3, and their front ends have considerable ireedom to rise and fall to conform to unevenness or the ground.

Pivoted' to each hactionelement I; at it is a forwardly projecting arm ll. These arms support and impel a scraper blade l0.

On each side of the tractor there' is a'link H pivoted to the rear of the tractor at 1|, and a'link per arm 617. This pivot need not be actually on push-arms i5, but preferably should be adjacent point It. Whenever in the claims, I use the phrase pivotally supported by it is intended to be generic to the pivotal sup rt of ripper arm 47 on the push arm l5, and any other equivalent support therefor.

Ripper arms 4! carry a cross piece 48, which in turn carries the ripper teeth 49. Pivotally supported by each push-arm i5 is a link 58, having a series of holes M. The forward portion of each ripper arm 41 has a cooperating hole whereby it can be secured'to this link 50, by any appropriate means such as a bolt. 7

The rearward portion of the ripper assembly carries appropriate means, such as a chain". for securing the ripper in elevated position, as by hookingthechain 'overlthe projecting end of pivot i8 on the tractor. But any othermcomparable means may be employed for this purpose.

When not muse, link it can lie forward in bracket 53 on push-armv l5.

The operation of my invention is as follows: When chains I2 are hooked over pivots I8, and

links cl are lying'in brackets 53, my combined bulldozer and ripper operates bulldozer.

To operate it as a combined ripper and bulldozer, the blade It is lowered to the ground, as shown in full lines in Figure 1. Links 50 are then swung up and pivotally secured to ripper arms 41,

and chains 52 are detached from. pivots l8.

Raising the bulldozer blade now lowers the ripper, and vice versa.

Othe tools than the blade I could be carried by the push-arms l5.

It is to be understood that the same principles can be employed to attach my ripper to any other "comparable form of dirt-moving equipment, for

control by the same controls, selectively or simultaneously. I

7 Having now described and illustrated one form otmy invention, I wish itto be understood that my invention is not to be limited to the specific term or arranaement or parts hereinbeiore described except as specified in the appended claims.

' Iclaim:

1. In a combined bulldozer and ripper, for attachment to a tractor, the combination'oi: a pair of push-arms, pivotaily attachable to a tractor; means supportable by the tractor, for raising and lowering these arms; a transverse blade, carried by these arms; two ripper arms, each P t supp rted by one or the push-arms adiacent its rear end; a link pivoted on each pusharm; means oneach push-arm for supporting its link in inactive position; means for operatively connecting each link to its ripper arm; a transverse. tooth-carrying member, supported by the ripper arms, ripper teeth carried by'this transverse member; and means for supporting the as a conventional ripper arms, directly by the tractor, in inactive elevated position.

'2. In a combined tool and; ripper, for attachment to a tractor, the combination or: a pair 0! push-arms; means supportable by-the tractor, for raising and lowering these arms; a tool, carried by these arms; two ripper arms; the. push-arm and the ripper arm on each side being pivotally supported by' the tractor at points closely adjacent to each other; a link pivoted on each push arm; means for operatively connecting each link means whereby this pulled tool may be pulled by j the tractor; means whereby the pulled tool can be operatively connected to the pushed tool so as'to be moved into and out of operative position by the motion of the pushed tool; and means whereby the pulled tool, although still maintaining its pulling connection to the traction but operatively tool, can be locked disconnected from the pushed spite of motion of in raised position, inactive in the pushed tool. I v

4. In a combined pushed tool and pulled tool, for attachment to a tractor, the combination of: a pushed tool; means for attaching this tool to a tractor so that it may be pushed thereby; a pulled tool; means whereby this pulled tool maybe.

pulled by the tractor; eans, carried by the tractor, for moving one t'ooginto and out of operative position; means, wher by said one tool can be i operatively connected to the other tool so as to be moved into and out of operative position by the motion of the othe tool; and means whereby said one tool, although still maintaining its operative connection to the tractor, but operatively disconnected from the other tool, can be locked in raised, position, inactive in spite oi motion 0! the other tool.

THOMAS R. PAUL-SEN. l 

